Horse power is not an indication of speed.
The speed of any vehicle depends on a variety of factors.
What medium through which it is moving. (Air, water, land, space)
The power of the engine.
The weight of the vehicle.
The streamlining.
The gear ratios. (If any)
The efficiency of the system.
A 6 hp outboard will go about fast enough to plane a 10 ft. aluminum boat, with one passenger aboard.
about 40mph
Yes, but not very fast.
50 mph
It will go about 40 to 50 mph
About 10 to 12 on plane
Not as fast as DL360 G6
snail pace
15
There are many more factors involved than just hp. No way to answer that one with hp only.
50 to 60
165 hp